Door lock



Dec. 13, 1960 A. DUPERE 2,963,897

DOOR LOCK Filed Nov. 13, 1958 2 Sheets-Sheet 1 IIIIIW'I 7" M may WyrraU/E. msg

Dec- 13, 1960 A. DUPl-:RE 2,963,897

DOOR LOCK Filed Nov. 13, 1958 2 Sheets-Sheet 2 @MWL/wim United States vPatent O DOOR LOCK Abraham Dupere, 9670 Notre Dame St. E., Montreal, Quebec, Canada Filed Nov. 13, 1958, Ser. No. 773,745

2 Claims. (Cl. 70`447) This invention relates to a door lock.

The invention relates more particularly to a lock of the kind wherein two key barrels, in axial alignment, are threaded into a lock housing and are releasably locked in assembled position by screws the heads of which are accessible to a screwdriver inserted through apertures made in the face plate of the housing. l

Locks of this type are not proof against tampering. When the door is open, the screws may be slightly turned to release the barrels, following which the barrels may be easily removed and substituted by other barrels the combination for which an intending burglar has keys.

Therefore, the principal object of the .invention is to provide a lock of the type described, improved so as to prevent tampering.

A speciic object of the invention is to provide, in a lock of the type described, simple and etiicient means for covering and uncovering the screw apertures, such apertures being so covered and uncovered automatically as a function of the operation of the bolt.

In the drawings, wherein like numerals of reference indicate corresponding parts in the various ligures,

Figure 1 is a front view of the lock;

Figure 2 is a rear view of the cover of the lock housing;

Figure 3 is a front view of the lock, with cover removed, showing the bolt in door-unlocking position;

Figure 4 is a view similar to Figure 3, but showing the bolt in door-locking position;

Figure 5 is an end view showing the screw apertures closed (covered) and Figure 6 is a view similar to Figure 5, but showing the screw apertures open (uncovered).

Referring now by numerals to the drawings, "10 shows the housing. The housing comprises a main casting or part 11 formed with a horizontal bottom wall 12, a horizontal upper wall 13, a vertical rear wall 14, and an end transverse vertical wall 15. Secured to the main part or casting 111 of the housing, is a face plate 18. The face plate is so secured by screws 80 inserted through holes (not shown) in the rear wall 14 and threaded into lugs 63 integral with and extending from the face plate. A cover 16, removably secured to the main casting 11, completes the housing. 'Ihe cover may be removably attached to the main part 11 of the housing, as by a screw 21 inserted through a hole 81 in the cover and threaded into a tapped hole 22 in a boss 23 integral with and rising from the rear vertical wall 14 of the main part 11 of the housing. A shallow lug 17 formed on the inside face of the cover 16 is received into a recess or notch 78 formed into the edge of the upper wall 13 of the main part 11 when the cover is secured in position on the main part 11, and co-operates with the screw 21 in retaining the cover in its operative position.

The housing is adapted to be inserted into a recess formed into the vertical face of the door, at its unhinged end, and is retained in the recess by attaching the face plate 18 to such face by screws (not shown) inserted into apertures 20.

. integral part of the main part 11 of Vthe housing, and ,is-

held against upward displacement by a lug or guider37-y Threaded into the wall 14 of the main part 11 is a conventional key barrel B. Threaded into the cover 16, in the axis of the barrel B, is a similar barrel B1.

As is well known, the barrels project through apertures (not shown) in the cover 16 and the wall 14 of the main casting 11 to present their outside faces substantially flush with the opposite faces of the door. It is through these apertures that the barrels are threaded into the lock housing to complete the lock, after the housing has been asthreaded through a boss 29 integral with the cover 16..l

The arrangement is such that the screws are disposed in axes parallel with the wall 12 (and wall 13) of the main part 11 of the housing.

Disposed in the longitudinal axes of the screws 27 are'y apertures 78 made through the face plate 18, so that access to the heads of the screws may be gained by ascrewdriver inserted Vthrough the apertures, either to re'- leasably lock the key barrels in position, or to release them. l

The bolt of the lock, shown as 32, slides in Vone direc-.fl

tion (from left to right as seen in Figure 4) to engage the door-keeper (not shown) to lock the door closed, and slides in the opposite directionto disengage the keeper to unlock the door. The bolt forms an integral part of an elongate shoe member 34 one end of which isi` slidably supported on a lug or guide 36 formed as'an rising from the wall 14 of the main part 11 of the housing, against which the upper edge of the shoe member 3 4* slides.

A stop 38 formed on the end wall 15 of the main part 11 of the housing limits the rearward movement of the shoe member 34 (and the bolt) when the bolt is in its door-unlocking position.

Pivoted on a pin 39 carried by the shoe member 34 is a latch member 40 which is formed with a vertical extension or abutment 41. This pivoted member is urged upwardly normally to engage the lug 37, by a leaf spring 43 anchored at one end in the pivoted member and having its free end tensioned against a lug 44 depending from the shoe member 34.

The abutment 41 is adapted to be presented to One side or the other of the lug or guide 37 according as to whether the bolt is in door-locking position or doorunlocking position. When the bolt is in door-unlocking position, as seen in Figure 3, the abutment 41 lies to the left of the lug 37.

In this position of the bolt, the bolt cannot be moved to door-locking position. On the other hand, when the bolt is in door-locking position, as seen in Figure 4, the bolt cannot be moved to door-unlocking position.

The pivoted latching member 40 is formed on its free end with an upwardly-extending portion or cam 49 received between two spaced portions or shoulders 45 and 46 formed on and rising from the shoe member 34. The shoulder 46 is adapted to be operatively engaged by the end of the actuating arm 24 of either of the barrels, when either barrel is turned by the key to move the bolt to door-locking position; on the other hand, the shoulder 45 is adapted to be operatively engaged by the end of the actuating arm 24 of either of the barrels to move the bolt to door-unlocking position.

As the actuating arm 24 of either barrel is actuated to move the bolt to door-locking position, the end of the arm 24 irst slidably engages the cam 49, to depress the latching member 40 andfree it from the abutment 41 of the lug 37, and then engages `the shoulder 46 to move the bolt `on its door-locking. stroke.

Similarly, Vas the actuating arm 24 of either barrel is actuated to move the bolt to door-unlocking position, itrrstrslidably engages the cam 24 to depress the latching member `and free the abutment 41 of the lug 37, and then engages the ,shoulder 45 to move the bolt on its door-unlocking stroke.

The lock thus far described is a conventional one, and has been on the market for many years.

My improvement will now be described.

Slidably mounted on the inside face of the 'face plate 18, to overlap or cover therscrew apertures 78,. are two plates 50-50, joined together to move as one. They may be so joined together as bya post or member 51 extending at right angles to theV plane of the plates.

If preferred, one single plate may be used.

'I'he post is slotted as at `52 to` form or present a pair of spaced, parallel ears Ycarrying a transverse pin or pivot 53.

As already stated, the plates 50-50 are made to close or cover the apertures, 78, when the bolt is being actuated to door-unlocking position, and to clear or uncover the apertures when the bolt is being moved to door-locking position. Accordingly, the post 51 is operatively connected to the shoe member 34 by a lever 54 pivotally supported, intermediate its length, as at 55, to a boss 57 extending from the wall 14 of the main casting 11. To so operatively connect the lever to the shoe member, one arm, 56, of the lever is received in a recess 58 made into the shoe member. The other arm of the lever is received between the ears of the slotted post 51 and is formed with a slot 59 slidably receiving the pin 53. Y

Conveniently to slidably mount the plates 50-50 in the face plate 18, the face plate is formed with two grooves 611-60, and a slight clearance provided between the wall 13 of the main part 11 of the housing and the Y 4 face plate, as shown at 61, and a groove formed in the lug 63 to dene a space 64.r The plates are thus guided longitudinally in the grooves and held against substantial displacement away from the face plate.

What I claim is:

l. In a lock of the type described, the lock including a housing having at least one aperture at one end for access by a tool to a barrel locking screw, and a bolt Y' actuated by the barrel and movable between door-locking position and door-unlocking position, the improvement comprising: a member movable on the housing to cover and uncover the aperture, and an operative connection between said member and the bolt actuating means to move said member in one direction to cover the aperture when the bolt is in door-unlocking position and to move said member in the opposite direction to uncover the aperture when the bolt is in door-locking position.

2. In a lock of the type described, the lock including a housing adapted to be inserted into operative position in a recess formed in the outer end face of a door and having at least one aperture through the outer end of the housing for access by a tool to screws releasably locking a pair of barrels, a bolt movable in the housing and means actuating said bolt between door-locking position References Cited in the tile of this patent UNITED STATES PATENTS 971,333 weed sept. 27, 1910 1,926,102 Keeler sept. 12, 1933 2,320,177 v Golden er e1. Mey 25, 1943 2,776,157 Eure Jan. 1, 1957 

